Daewoo Shipbuilding & Marine Engineering (DSME), Korea’s second-largest shipbuilder, signed a $400 million deal to build four oil tankers for a Greek firm, according to a report by The Korea Times.

Under the deal with Maran Tankers Management, a unit of Greece’s largest shipper Angelicoussis Group, Daewoo plans to deliver the tankers by 2016, the company said in a statement.

A separate contract was also signed with an option to change bunker-C oil-propelled engines of the tankers to liquefied natural gas-powered once. If the Greece shipper wants the engine change, the price of the oil carriers will be increased from the originally contracted price, a company official said.